GAS5 and neoplasm: The lncRNA growth arrest‐specific 5 (GAS5) was generally regarded as a tumour suppressor, acting as a miR‐21 sponge, that could inhibit the proliferation and promote the apoptosis of various cancer cells.23, 24 Interestingly, the study showed that GAS5 contained a binding site for miR‐23a and acted as a sponge of miR‐23a.